5 Mar
2025
5 Mar
'25
4:14 p.m.
From: Rob Pike
The notion that the struct layout must correspond to
the hardware
device's layout is about as non-portable as thinking can get.
I'm confused; I thought device register layout is inherently about as
non-portable a thing as one could have, generally.
(Exceptions: 1) the device is basically a single chip, so interfaces on two
machines might be essentially identical, if they use the same chip; 2) someone
made a 68K card that plugged into a QBUS, so drivers on a PDP-11 and that 68K
could be identical.)
Or did you mean that one could somehow disassociate the struct layout and the
details of the device (assuming it has addressable registers, as became
common)? How (I'm missing it)?
Noel